Fault finding – System operation13B
Program No.: C4
Vdiag No.: 04, 08, 18, 1C,
20, 24, 26, 28, 34, 38, 44,
4C, 54, 58, 5C, 60, 62, 74
Warning light management:
Instrument panel display
The computer displays certain information on the instrument panel relating to engine operation. This concerns five
– the pre-postheating warning light,
– the coolant temperature warning light,
–the level 1 fault warning light (non-critical fault),
–the level 2 fault warning light (emergency stop),
–the EOBD (European On Board Diagnostic) warning light,
These six functions are represented by 3 warning lights and/or messages displayed by the on-board computer.
Orange pre-post heating/non-critical fault SERVICE warning light (severity 1)
This light is used both as an in-operation indicator light and as a system fault indicator:
– Continuously lit with + after ignition feed:
Indicates preheating of the spark plugs.
– Continuously lit with the Check injection message:
Indicates a level 1 fault (involving operation of the injection system in defect mode).
The driver should have the repairs carried out as soon as possible.
Temperature / red emergency STOP warning light (level 2)
This indicator light is used both as an in-operation indicator light and as a system fault warning light. It lights up for
3 seconds after the ignition is switched on (automatic test procedure managed by the instrument panel):
– Continuously lit:
Indicates engine overheating (the driver is free to choose whether or not to stop the vehicle).
– Continuously lit with the faulty injection message:
Indicates a level 2 fault (In this case, the injection is automatically cut after a few seconds).
The driver should carry out repairs as soon as possible.
ORANGE Excessive pollution EOBD warning light
Symbolised by an engine, it lights up for approximately 3 seconds when the ignition is switched on.
This warning light comes on if the system has one or more EOBD faults.
This warning light is used to alert the driver to injection faults that could lead to excessive pollution, or if the EOBD
system (European On Board Diagnostic) has been deactivated.
The injection computer requests illumination of the EOBD warning light for a present fault only after three
consecutive driving cycles.
The 3 second visual inspection when the ignition is switched on (automatic test procedure managed by the
instrument panel) is carried out by the injection computer.
Special particle filter ORANGE warning light or warning message (depending on instrument panel)
Only for Vdiag: 18, 1C, 54, 20, 58, 5C, 24, 26 and 60.
This warning light or message is used to warn the driver that the particle filter is loaded with particles, (see the soot
weight thresholds for illumination of the warning light for fault DF312 Speed request) due to driving conditions which
were not suitable for regeneration to take place. The driver must then drive as soon as possible at an average speed
of 48 mph (80 km/h) subject to the road conditions and authorised speed limits, until the warning light goes out.